4. A ball is dropped from the top of a tower 85 ft high at the same instant that a second ball is thrown upward from the ground with an initial velocity of 45 ft/sec. When and where do they pass, and with what relative velocity?

4. A ball is dropped from the top of a tower 85 ft high at the same instant that a second ball is thrown upward from the ground with an initial velocity of 45 ft/sec. When and where do they pass, and with what relative velocity?

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter3: Motion Along A Straight Line

Section: Chapter Questions

Problem 73P: A very strong, but inept, shot putter puts the shot straight up vertically with an initial velocity...

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Concept explainers

Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.

Question

4. A ball is dropped from the top of a
tower 85 ft high at the same instant
that a second ball is thrown upward
from the ground with an initial velocity
of 45 ft/sec. When and where do they
pass, and with what relative velocity?

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